The coefficient of xkin the expansion of 1−2x−x2ex is

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manpreet Tuteehub forum best answer Best Answer 2 years ago

 

The coefficient of xkxkin the expansion of 12xx2ex1−2x−x2ex is

This a question of university entrance examination, which my teachers didn't taught me and not in my syllabus.

I referred got this equation from Hall and Knight Algebra :

Coefficient of xrxr in the expansion of 1axx2ex1−ax−x2ex is given by

1rr!{1+arr(r1)}−1rr!{1+ar−r(r−1)}

 

However applying this answer gives me :

 

1kk!(1+3kk2)
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